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Old 08-08-2003, 05:37 PM
manny manny is offline
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
I think you're talking about the valve rotators. If so, the purpose is to turn the valve slightly, every time it opens & closes.
This results in a kind of " self-cleaning " action, lessening the chances of a minute piece of carbon holding a valve open.
If it didn't rotate anymore, you may never see a problem.
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